Final Results:
Introduction to PowerDesigner
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(1) What is PowerDesigner?
Power Designer is a CASE tool set of Sybase, which can be used easily对管理信息系统进行分析设计，他几乎包括了数据库模型设计的全过程 -
(2) What are the characteristics of PowerDesigner?
Advantages:
no need to use statements such as create table to create a table structure, database statements can be automatically generated.
Database designers can only focus on how to model data
PowerDesigner draw use case diagram
- (1) What is UML?
Unified Modeling Language (UML) also known as Unified Modeling Language or Standard Modeling Language - (2) What are the characteristics of UML?
》》Provide modeling and visualization support.
It is a graphical language that supports modeling and software system development. It provides modeling and visualization support for all stages of software development, including from requirement analysis to specifications, to construction and configuration.
》》UML It contains a lot of graphics (use case diagrams, class diagrams, state diagrams, etc.), of which use case diagrams are the graphics that best reflect the functional structure of the system. - (3) Use PowerDesigner to draw use case diagrams
Use case diagrams are used to describe用户/角色which functions can be operated 
I have uploaded the above two documents to the blog, if you need it, you can download it
New physical model
Create department table and employee table
Edit table name:
Edit column:
Add table relationship (primary key foreign key)
Finally generate the database
Click Generate Database of Database
Sure to generate
carry out
